Process for preparing light magnesium oxide and calcium carbonate powder by utilizing dolomite acid method

Abstract

The invention relates to a process for preparing light magnesium oxide and calcium carbonate powder by utilizing a dolomite acid method, which comprises: dolomite is crushed and pulverized into powder; the powder is dissolved by utilizing hydrochloric acid to be prepared into a solution with key components of MgCl2 and CaCl2; the pH value is adjusted, the ions of Fe3<+>, Al3<+> and the like in the solution are eliminated, and the solution becomes a pure MgCl2 and CaCl2 solution; ammonia is introduced into the solution to react so that Mg2<+> is converted into Mg(OH)2 precipitations, and the light magnesium oxide powder is prepared through filtering, washing, drying and calcining; the filtrate is prepared into calcium carbonate crystals through continuous ammonia introduction and carbonization; and the calcium carbonate crystals are dried to prepare the light calcium carbonate powder. The process has the advantages that the design is reasonable; the energy consumption is low; the purities of the prepared light magnesium oxide and the calcium carbonate are above 98%; the resource utilization ratio of the dolomite is larger than 95%; and the process is worthy of being popularized and implemented.

Description

technical field [0001] The invention relates to a process for preparing light magnesium oxide and calcium carbonate powder by dolomite acid method. Background technique [0002] Dolomite is a relatively common carbonate rock, the main mineral component is dolomite. The proven dolomite resources in the world are more than 50 billion tons, and the high-quality dolomite reserves in China exceed 4 billion tons, which are distributed in Liaoning, Hebei, Shanxi, Sichuan, Hunan, Hubei, Henan, Shaanxi, Jilin, Jiangsu and other provinces Area. [0003] Light magnesia is an important industrial inorganic salt product, which can be used in the manufacture of ceramics, enamel, refractory crucibles and refractory bricks, etc. as a filler for polishing agents, adhesives, paints and paper; it is also used in glass, dyes, phenolic plastics and other industries. Therefore, light magnesium oxide is one of the most important and widely used products in the magnesium compound series. [000...

AI Technical Summary

Problems solved by technology

[0005] At present, the utilization of dolomite in my country is concentrated in metallurgy, chemical industry, building materials and agriculture industries. Disadvantages such as high energy consumption, certain environmental pollution, and large waste discharge

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